Calculating-machine



no Model.)

' 2 sheets-sum 1'. F. L. BANGROPT.

CALCULATING MACHINE.

No. 377,823. Patent-ed Feb. 14, 1888.

Witnusaa ATTORNEY.

2 T P 0 R G N A B L L CALCULATING MAGHINB.

No. 77, 28.. Patented Fab. 14, 1888.

Inventnr aha/1M witnanaa:

ATTORNEY.

N. PETERS. Plwlolflhognphar. Wilmington D86,

- UNITED S ATES PATENT OFFICE.

FREDERICK L. BANOROFT, OF ST. PAUL, MINNESOTA.

CALCULATING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 377,823, dated February14, 1888, Application filed August 19, 1887. Serial No. 247,388. (Nomodel.) Patented in Canada July 2, 1887, No. 27,113.

To aZZ whom it may concern:

'Be it known that I, FREDERICK L. BAN- CROFT, a citizen of the UnitedStates, residing at St. Paul, in the county of Ramsey and State ofMinnesota, have invented a new and useful Improvementin Calculators,(for-which I have obtained a patent in Canada, No. 27,113, bearing dateJuly 2, A. D. 1 387,) of whichthc'following is a specification.

My invention relates to improvements in calculators in which arearranged a series of 7 parallel wheels, upon the periphery of which areplaced numbers and arranged pins to correspond with the said numbers,with eccentrics and spring-pawls to operate the several wheels inconjunction the one with the other, the object of my invention being toprovide a simple and efficient means for adding columns of numbers andat the same time keep the sum before the operator. I attain this objectthrough the mechanism shown in the accompanying drawings, in which--Figure l is an isometric view of the complete machine. Fig. 2 is asectional view of the ma chine,showing the wheels illustrating thestoppins. Fig. 3 is a view of a wheel, showing the eccentric D, showingthe position of the pawl engaged with the pin of the next wheel. Fig. 4is a view showing the eccentric D when the pawl is disengaged from thepins of the next wheel. Fig. 5 is a sectional view of the calculator,showing the relative position of the Wheels and the columns of figureson the out side of the machine. Fig. 6 is an enlarged view of the wheels0, showing the construction of the mechanism for rotating the same inrelation the one with the other. Fig. 7 is a plan view of theeccentric-cam D and shaft 0.

Similarletters refer to similar out the several views.

I make a cylindrical box, A, having a rectangular base, with a part, B,projecting beyond the cylinder, which is adjusted so that the long partsthroughaxis is horizontal. The side of this cylinder A is slotted atconvenient distances to allow the pins 0 to project through these slots.At the lower end of the slotS is a widened space, S, made large enoughto show the whole of a figure on the wheel 0. In the part of the box Bare slots 13, which are opposite the slots in the cylindrical part ofthe box A, and are of equal width with the slots in the side of the boxA and long enough to allow the pins 0 to pass through them readily.

On the front side of the cylinder A. are marked a series of numberscommencing at the bottom of each slot and running from one (1) up tonine (9) in parallel rows with a line drawn to each slot toward theleft. Two or more spaces at both ends of the cylinder are colored of adifferent color from the rest of the cylinder.

WVithin the cylinder I make a central shaft, 0, suspended upon a hanger,N, and a socket at the other end of the cylinder. To this shaft I attacha series of wheels, 0, at convenient distances and of any requirednumber. Each wheel is marked on its periphery into twenty (20) equallydistant places and numbered from one (1) to nine (9) and zero, (0,)there being two (2) sets of such numbers on the face of each wheel. Onthe line of demarkation of each number is inserted a pin, 0', projectingoutward in a radial line from the axis and of a convenient length. Thesepins 0 are so placed that they project through the slots S in thecylinder-A, and are so arranged that when a number shows at the lowerend of the slot S at S the pins will be opposite the line of therespective numbers on the side of the cylinder A.

On one side of the wheels 0, I arrange in a circle twenty (20) pins, Q,at equal distance from each other, and so adjusted that they will engagewith the end of the pawl I at the proper time, and they are alsooperated on the springstop It. These pins are solong that they will beengaged by the pawl I, but will not interfere with the rotation of thewheel on either side of it.

On the other side of the wheel C, I make a compound spring-pawl, whichconsists of a flat piece of metal, G, of a rectangular shape, pivoted tothe wheel 0 at a convenient point by the screw and washer 9, upon whichit swings. About the middle of the pawl G is a pin, 1), and at the endof the pawl farthest from the pivot q is a second pin, 6, to which isattached the spiral spring M, which is attached to the pin e at aconvenient point on the side of the wheel 0. At a convenient point onthe pawl G is secured a bracket-arm, K,- which is of an L shape, thelonger arm being attached to the pawl G, and the shorter projecting outfrom it at right angles. At the extreme outer end of this arm K is aspring, L.

From the upper part of the pawl G, at a convenient point, is an arm, J,projecting outward toward the next wheel of the series, and on the endof this arm is pivoted by the screw f a bent lever or arm, I, which atthe end farthest from the pawl G has a hook, so constructed that it willengage the pin Qof the next wheel of the series. The end of thelever-arm I nearest the pawl G is slightly bent downward, and in thehorizontal line it is bent in two directions, so as to bring the end ofthe arm I near the pawl G and over the pin b. The springL is attached tothe long arm of the lever I at a point back of the pivot f, and beingsecured at the other end to the arm. The arm K keeps the hook end of thelever I upward and the other end against the pin 1).

On the shaft 0, between each wheel of the series, is an eccentric-cam,D, having two cams at equal distances from each other, as D. Between thecam D and the wheel 0, on one side, is a collar, F, provided with aset-screw, a. This cam D and collar F are united securely together andheld to the shaft 0 by the screw a. A second collar, H, which is looseupon the shaft 0, serves to keep the two wheels at the same relativedistances apart. The last wheel on the left-hand side of the series hasno pawl G or cam D on it, as shown in Fig. 6.

Having thus described the parts of my machine, I now proceed to explainthe method of operating the same.

I place the finger upon the pins of each wheel separately and pull thepin 0 downward until the numbers showing in the slots S are all zero. Toadd any number, I read off the number, commencing with the firstlefthand figure, and, putting my finger on the pin corresponding to thatnumber, I bring it down to the board B, or until it shows at the slots.I then read the next figure to the right hand and bring it down with thefinger in the same way to the board B, and so on to the end of thenumbers to be added. In this way, when I have carried any one wheel overnine (9) figures of the disk, the arm K, which rides over the edge ofthe cam D, has reached the summit of the cam D and brings the hub end ofthe lever I upward, and it, the lever I, engages with the pin Q, of thenext left-hand wheel of the series, and the next movement of the givenor initial wheel moves thesecond wheel,by means of the pin Q, onefigure, and as the camDis rigidly fixed to the shaft 0 and cannot move,the arm K passes over the summit of the cam and drops down by means ofthe springM into the notch D and against the pin h,whichlowers the hubof the lever I, so that the pins Q of the wheel 0 are not engaged by ituntil it has passed the half of a circle or nine figures,when it isagain brought in position to move the next wheel, as stated. Thus, inreading off the numbers to be added the movement of a certain wheel, 0,over nine (9) figures willat the next stroke move the wheel next to theleft one place. To prevent the wheels 0 from slipping back, I use thespring-stop It,which is a curved spring, and made to fit between two (2)of the pins Q of the wheel, and while it will allow of free motion inone direction retards itin another, and is so constructed that the pins0' of the wheel 0 are always opposite the lines on the cylinder A. Toadjust these springs It, ofwhich there is one to each wheel, I loosenthe set-screw d on the shaft P, which shaft is supported by the standardI on asoeketin the end ofthe box A.

I am aware that prior to my invention calculators having revolving disksand numbers upon their faces have been invented and used, and I do not,in view of this state of the art, lay claim to the broad principle ofdisk-calculators therefor; but

IVhat I do clain1,and desi re to secure by Letters Patent of the UnitedStates, is

1. In a calcnlating-machine, the eccentriccam D, shaft 0, collar F, andset-screw a, combined with the pawl G, pivot g, arm K, spring L, pin 1),lever I, pivotf, spring M, pin 6 and pin 6, with the wheels 0, pins 0,and pins Q, all arranged and operating substantially as set forth anddescribed.

2. In a ealculating-machine, the numbered wheel G, pins 0, pin Q, andshaft 0, combined with the eccentric D, pawl G, lever I, arm J, arm K,and springs M and L, all arranged and operating substantially as setforth.

3. The calculating-machine consisting of a cylinder, A, with a numberedcover-plate coloredin desired colors, with slots S and S,board B, slotsB,the wheel O,with numbers and pins 0' on the periphery, the pins'Q,pawl Gr, pivot 9, arm K, lever I, pivot 1'', pins 1), e, and e, springsL and M, cam D, shaft 0, collars F and H, pin it, the shaft P, springIt, and set-screw a, all arranged as set forth and described.

FRED. L. BANOROFT.

In presence of-- H. Hanrr, J r., S. N. WHITNEY.

